audit: add netlink audit protocol bind to check capabilities on multicast join

Register a netlink per-protocol bind fuction for audit to check userspace
process capabilities before allowing a multicast group connection.

Signed-off-by: Richard Guy Briggs <rgb@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --cc include/uapi/linux/capability.h
Simple merge

diff --cc kernel/audit.c
Simple merge

diff --cc security/selinux/include/classmap.h
Simple merge